Grinding machine

ABSTRACT

A grinding machine for forming a helical cutting surface on a tool, especially a tool such as a stepped twist drill. The grinding machine generally includes a rotary grinding wheel, which grinding wheel is fixedly positioned relative to a frame, and a table movably mounted on the frame adjacent to the grinding wheel. A power source rotatably drives a drive shaft mounted on the table. The power source is connected through the drive shaft to an epicyclic-gear train also mounted on the table. A drive housing is pivotedly mounted on the table, with a work piece drive shaft slideably and rotatably mounted in the drive housing. The work piece drive shaft is driven by the epicyclic-gear train. Connected to the work piece drive shaft is a work piece holder, which supports a work piece in position for engagement with the grinding wheel. The epicyclic-gear train is connected to a control device for controlling movement of the work piece relative to the grinding wheel to generate a helical surface on the work piece as the work piece is carried by the table past the grinding wheel. A cam shaft is driven by the power source, and the cam shaft&#39;&#39;s rotation is synchronized with that of the drive shaft. A first cam affects axial movement of the work piece drive shaft and the work piece relative to the grinding wheel, and a second cam on the cam shaft regulates pivotal movement of the drive housing to affect the peripheral engagement of the work piece with the grinding wheel to affect the depth of the cut to be taken in the work piece by the grinding wheel.

limited States Patent [191 Karwinski 1 May 8, 1973 [54] GRINDING MACHINEGerhard E. Karwinski, Prospect, Ill.

[73] Assignee: CTR, lnc., Elk Grove Village, 1]].

[221 Filed: Apr. 12, 1971 [2]] Appl. No.: 133,224

[75] Inventor: Mount [52] US. Cl ..51/95 LH, 51/105 R [51] Int. Cl..1524!) 3/26 [58] Field of Search ..5 H95 LH, 95 R, 95 WH,

5l/95 T6, 97 R, 105 R, 165.8, 165.89, 165.9, 232,288

[56] References Cited UNITED STATES PATENTS Primary Examiner-Donald G.Kelly AttorneyStone, Zummer & Aubel 571 ABSTRACT A grinding machine forforming a helical cutting surface on a tool, especially a tool such as astepped twist drill. The grinding machine generally includes a rotarygrinding wheel, which grinding wheel is fixedly positioned relative to aframe, and a table movably mounted on the frame adjacent to the grindingwheel. A power source rotatably drives a drive shaft mounted on thetable. The power source is connected through the drive shaft to anepicyclic-gear train also mounted on the table. A drive housing ispivotedly mounted on the table, with a work piece drive shaft slideablyand rotatably mounted in the drive housing. The work piece drive shaftis driven by the epicyclic-gear train. Connected to the work piece driveshaft is a work piece holder, which supports a work piece in positionfor engagement with the grinding wheel. The epicyclic'gear train isconnected to a control device for controlling movement of the work piecerelative to the grinding wheel to generate a helical surface on the workpiece as the work piece is carried by the table past the grinding wheel.A cam shaft is driven by the power source, and the cam shafts rotationis synchronized with that of the drive shaft. A first cam affects axialmovement of the work piece drive shaft and the work piece relative tothe grinding wheel, and a second cam on the cam shaft regulates pivotalmovement of the drive housing to affect the peripheral engagement of thework piece with the grinding wheel to affect the depth of the cut to betaken in the work piece by the grinding wheel.

20 Claims, 9 Drawing Figures Patented May 8, 1973 5 Sheets-Shoot 1 m S WRM A MK NE m WA H R E G Patented May 8, 1973 3,731,434

5 Sheets-Sheet 2 FIG. 3

INVENTOI? GERHARD E. KARWINSKI it %W--d4 B) Af/ys Patented May 8, 1973 5Sheets-Sheet 5 INVENTOR GERHARD E. KARWINSKI By Mn Patented May 8, 19735 Sheets-Sheet 4 wNN NE *9 m:

v INKEZVTOR GERH'ARD E. KARWINSKI Patented May 8, 1973 5 Sheets-Sheet .5

FIG.?

INVENTOR GERHARD E. KARWINSKI g Y M Af/ys GRINDING MACHINE BACKGROUND OFTHE INVENTION Various tools are ground periodically for various reasons.In certain tools, such as, twist drills, it has been found to bedesirable to grind the front or forward portion of the twist drill to areduced size so that the drill is a stepped drill and may be used as acentering drill in certain high-production operations. A common methodfor making a stepped drill is by reducing the size of an ordinary twistdrill at its front end in a threestep operation. The drill is grounddown to define the margin, and then the land is ground. The thirdoperation is to grind a bevel at the end of the reduced portion so thatthere is no sharp drop-off between the larger and smaller portions ofthe twist drill.

In order to reduce the number of operations which are required to grindsuch a work piece, a number of grinding machines are provided whichsolve some of the problems. One of such machines is shown in US. LettersPat. No. 2,792,676. One of the principal problems with a machine of thistype is that the machine does not provide a constant width true helicalmargin, which is required of a fine twist drill.

SUMMARY OF THE INVENTION The present invention relates to a grindingmachine which has a rotary grinding wheel fixed in one position. Therotary grinding wheel has mounted adjacent thereto a table which movesrelative to the grinding wheel to carry a work piece past the grindingwheel. The table has mounted thereon a power source which drivessimultaneously a drive shaft and a cam shaft so that the rotation of thedrive shaft and the cam shaft is synchronized. The drive shaft drives awork piece drive shaft through an epicyclic-gear train mounted on thetable. The epicyclic-gear train is connected to a control device whichincludes a straight edge fixed relative to the table. A follower mountedon the table engages the straight edge and is connected to theepicyclic-gear train so that as there is movement of the table in onedirection, the work piece drive shaft has its position relative to thegrinding wheel affected by a straight edge fixed exteriorally of thetable to determine a true helix on the surface of the work piece. Afirst cam is mounted on the cam shaft for moving the drive shaft axiallyfor the proper axial positioning of the work piece relative to thegrinding wheel. A second cam mounted on the cam shaft positionsperipherally the work piece in conjunction with the axial movementrelative to the grinding wheel to grind a margin and a land on the workpiece.

It is therefore a principal object of the present invention to provide agrinding machine capable of cutting a true helical surface with aconstant width margin on a twist drill.

It is a further object of the instant invention to provide a grindingmachine which will cut a margin, a land and a bevel between steps ofastepped twist drill inone operation.

It is a still further object of this invention to provide a grindingmachine which may be easily set up and adjusted.

It is still another object of the herein-disclosed invention to providea grinding machine which has a high degree of stability.

It is a still further object of the present invention to provide agrinding machine which is capable of generating a wide range of helicalsurfaces.

Other objects and uses of the present invention will become readilyapparent to those skilled in the art upon a perusal of the followingspecification inlight of the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a plan view of a portion ofa grinding machine, showing a specific embodiment of the presentinvention;

FIG. 2 is a side elevational view of a portion of the grinding machineshown in FIG. I, with the grinding wheel removed, portions broken awayin order to show better the interrelationship of certain of the partsand portions shown in phantom view in order to show clearly otherportions of the invention;

FIG. 3 is an enlarged plan view of a portion of the grinding machineshown in FIG. 1, showing a drive which is part of the present inventionand a control for the drive, with a portion of an epicycli'c-gear trainof the drive shown in cross-section to show the interrelationship ofcertain of the parts, especially the gears and carrier of theepicyclic-gear train;

FIG. 4 is an enlarged plan view of a work piece operator, which is partof the grinding machine shown in FIG. 1, shown connected to a work pieceholder and a work piece positioned in the work piece holder;

FIG. 5 is a side elevational view ofa work piece drive shaft housing,with a portion broken away in order to show better the constructionthereof;

FIG. 6 is an enlarged side elevational view of a pair of slide camswhich pivot the work piece drive shaft hous- FIG. 7 is an enlargedcross-sectional view taken on Line 77 of FIG. 1, showing theinterrelationship of various gears of the control for the drive;

FIG. 8 is a cross-sectional view taken on Line 88 of FIG. 1, showing thegear drive for a work piece drive shaft; and

FIG. 9 is a cross-sectional view, showing a cross-section of the workpiece, taken on Line 9-9 of FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings,and especially to FIG. 1, a grinding machine embodying the presentinvention is generally indicated by numeral 10. The grinding machine 10generally includes a frame 12 (shown only partially herein), a table 14movably mounted on the frame, and a grinding head 16 fixed to the frame12. The grinding head 16 includes a grinding wheel 18, which isrotatably mounted on the grinding head. A work piece operator 20 ismounted on the table 14 and controls the position of a work piece 22,which in this instance is a stepped two flute twist drill, relative tothe grinding wheel 18 for grinding specific surfaces on the work piece.

The table 14 is conventional in its construction in that it moves on theframe 12 relative to the grinding head 16 by a conventional andwell-known drive (which is not shown herein). The specific improvementin this grinding machine lies in the work piece operator 20, whichappropriately positions the work piece 22 relative to the grinding wheel18 to cut a helical cutting edge into the work piece.

The work piece operator 20 generally includes a fluid motor 24 mountedon the table 14, which fluid motor is connected to a gear drive 26. Thegear drive is connected to a drive shaft 28, which in turn is connectedto an epicyclic-gear train 30. The epicyclic-gear train is controlled bya carrier control 32. The epicyclic-gear train is connected to a workpiece drive 34, which is in turn drivingly connected to a work pieceholder 36. The gear drive 26 is connected to the fluid motor through apower gear 37 mounted on a cam shaft 38. The cam shaft 38 is connectedto a pair of cam assemblies 40 and 42 which affect the position of thedrive 34 relative to the grinding wheel in cooperation with an axialoperator 44.

The fluid motor 24 is a conventional fluid motor and is connected to asource of fluid under pressure by a pipe 46. The fluid motor providesthe basic power source for the work piece operator 20. The fluid motordrives simultaneously the drive shaft 28 and the cam shaft 38 throughthe gear drive 26.

Looking now to FIGS. 1 and 3, it may be seen that the drive shaft 28 isconnected at one end to a drive shaft gear 52, which is part of the geardrive 26, and the other end is connected to a sun gear shaft 54. A drivesun gear 56 is mounted on one end of the sun gear shaft 54 within ahousing 57. A plurality of drive planetary gears 58 mesh with the sungear 56 within housing 57, although only one of the planetary gears isshown in FIG. 3. Each of the planetary gears 58is fixed to a respectiveplanetary gear shaft 60, to which is fixed a second planetary gear 62.Each of the planetary gear shafts 60 is rotatably mounted in carrierside walls 64 and 66 of housing 57. The side walls 64 and 66 act ascarriers for the planetary gears. The housing has an outer shell 68,which is sealingly fixed to the side walls. Each of the second planetarygears 62 mesh with a second sun gear 70, which is drivingly connected toa second sun gear shaft 72.

The carrier control 32 is drivingly connected to the carrier side wall64. The side wall 64 has a short, hollow shaft 74 fixed thereto, inwhich the sun gear shaft 54 is rotatably mounted. Fixed to the hollowshaft 74 is a shaft gear 76, which meshes with a gear 78. The gear 78 isfixed to a rack gear 80, which meshes with a rack 82'. The rack 82 isslideably mounted in a slide 84 on table 14. The rack has a followerextension 86 extending from one end. A follower 88 is rotatably mountedon the extension 86 and is engageable with a straight edge 90. Thestraight edge 90 is formed integral with a head 92, which head isrotatably mounted on a head block 94, which head block is fixed to theframe 12. It may be appreciated that as the table 14 moves axiallyrelative to the drive shaft 28, the follower 88 moves among the straightedge 90 to rotate the carrier side wall 64, and thus move the planetarygears 58 relative to the sun gear 56 and move the planetary gear 62relative to the sun gear 70, thereby affecting the rotation of shaft 72.It is apparent that the angular position of the straight edge 90determines the rate of movement of the shaft 72.

The shaft 72 is drivingly connected to the work piece drive 34. Lookingnow to FIGS. 4 and 8, it may be seen that the sun gear shaft 72 isdrivingly fixed to a pinion 96. The pinion 96 meshes with an idler gear98, which in turn meshes with a center gear 99. The center gear mesheswith a drive shaft gear 100. As may be best seen in FIG. 5, the driveshaft gear 100 is formed integral with a collar 102, which is fixed to ahollow work piece drive shaft 104. The work piece drive shaft 104 has aflange 106 formed integral therewith, and a dead center 107 is mountedin the shaft 104. The work piece drive shaft is rotatably and slideablymounted in a work piece drive housing 108. The work piece drive housingincludes a body 110 having a drive cap 112 sealingly fixed on one endthereof. The cap 112 rotatably, slideably and sealingly engages the workpiece drive shaft 104. A work piece cap 114 is sealingly fixed to theother end of the body 110. The cap 114 also rotatably;

slideably and sealingly engages the work piece drive shaft 104. The workpiece drive shaft 104 has a groove 116 therein, with a lock ring 118mounted in the groove. A stop ring 120 is mounted in engagement with thelock ring 118. A spring 122 is mounted in the space between the workpiece drive shaftl04 and the interior of the body 110. One end of thespring 122 engages the stop ring 120, and the other end engages a ring124, which has a seal 126 mounted between the ring 124 and the end ofcap 114. A bearing sleeve 128 is mounted in engagement with the flange106 and is in sliding and stopping engagement with the cap 1 14.

The work piece drive 34 also has a pivot extension arm 130 extendingfrom the body 110. A pivot center 134 is mounted in the body 1 10, and apivot center 136 is mounted in the arm 132. A pivot yoke 138 is fixed tothe table 14 and has a pair of arms 140 and 142 extending upward, whicharms 140 and 142 pivotedly receive the pivot centers 134 and 136 toallow the body to pivot about the centers. It is important to note thatthe center of gear 99 is coincidental with the axis of pivoting so thatthe housing may pivot and still keep gear 100 in mesh with gear 99.

As may be seen in FIG. 4, the work piece holder 36 is attached to theflange 106. The work piece holder includes an annular plate 144, whichis fixed to the flange 106 around center 107. An adjustable post 148 hasone end fixed to the plate 144 and the other end of the post is fixed toavis'e 150, which vise has its center aligned with the center 107. Theworkpiece 22,.which in this instance is a stepped twist .drill, has itscenter positioned in the end of the center 107 and gripped in the vise,150 to be rotated thereby. A point holder 152 includes a receptacle154, which receives the point of the work piece. The receptacle 154 ismounted on an arm 156, which is supported by and axially positionable bya conventional and well-known arm control mechanism 158.

As was mentioned above, the cam shaft 38 is drivingly connected to thefluid motor 24 through the gear drive 26. A cam shaft drive gear 160,which is part of the gear drive 26, is fixed to the cam shaft 38. It maybe appreciated that the rotation of the drive shaft 28 and the cam shaft38 is interconnected and synchronized since they are interconnected bythe gear drive. Fixed to-the cam shaft 38 is a first cam 162, with afollower 164 engaging the cam. The follower 164 is mounted on a base166, which is connected to a first cam rod 168. The first cam rod isaxially movable by the cam and is connected to a slideable block 170,which in turn is connected to an adjustable arm 172 of the axialoperator 44. The arm is connected to a pivot pin 174, which pivot pinmay be moved along a pivot positioning block 176. A drive wheel 178 isrotatably mounted on the end of the arm 172, which wheel 178 isrotatably engageable with the collar 102 to displace the work piecedrive shaft axially against the spring 122. It may be appreciated thatthe amount of displacement of the wheel, and thus the displacement ofthe drive shaft, is regulated by appropriately positioning the pivot pin174 relative to the block l76and the arm 172.

A second cam 180 is mounted on the cam shaft 38. A second cam follower182 engages the cam 180, and the second cam follower is mounted on asecond base 184. The second base is connected to a second cam rod 186,which is slideable relative to the table and is connected to a carrier188. The carrier 188 is connected to the first and second cam assemblies40 and 42. Cam assembly 40 includes an upper cam face holder 190, whichis fixed to the body 110. A slide cam face 192 is fixed to the upperhead 190, and a mating second slide cam face 194 slideably engages thefirst cam face 192. A lower cam face carrier 196 supports the second camface 194 and is connected to the carrier 188. it may .be appreciatedthat the cam assembly 40 is adjustable relative to the housing toregulate the slope of the margin formed.

in like manner, the second cam assembly 42 has an upper cam face holder198, which is fixed to the housing 110. An upper slide cam face 200 isadjustably secured to the upper cam face housing, and a mateable lowerslide cam face 202 engages the upper carn face. The cam faces 200 and202 each have a step, which is best seen in FIG. 6. The steps in the camfaces are spaced apart the required width of the margin. The lower camface 202 is adjustably secured to a lower cam face carrier 204, which isfixed to the carrier 188.

The work piece 22 is loaded in the work piece holder 36 by placing thework piece into' vise 150. The work piece in the work piece holder 36 isoperatively positioned by mounting the plate 144 in driving connectionwith the flange 106. The center 107, which is fixed to the drive shaft104, centers the work piece. The other end of the work piece is centeredin the receptacle 154. The receptacle 154 is positioned by moving thearm 156 relative to the work piece. The operator adjusts the angularposition of the edge 90 in order to make certain that the grinding wheel18 follows the helix of the flutes of the work piece. It may beappreciated that inasmuch as the table 14 moves in a straight linerelative to the grinding wheel and the control for determining the angleof the helix is also a straight line at an angle to the direction ofmovement, a perfect helical surface is generated in view of the factthat two straight lines are used. Furthermore, any operative helix anglemay be generated by the instant device.

The fluid motor drives the gear drive so that the drive shaft 54 drivesthe sun gear 56, which in turn drives the planetary gear 58, and theplanetary gear 62 drives the sun gear 70, which in turn rotates theshaft 72, which is drivingly connected to the gear 100. The gear 100rotates the work piece drive shaft 104 so that the work piece is rotatedrelative to the grinding wheel. It should also be noted that thegrinding wheel is, of course, rotating; and the table 14 is movingaxially, that is, relative to the axis of the work piece.

The grinding wheel engages the work piece to grind the required surface.As the work piece rotates, simultaneously the cam shaft 38 is alsorotating in conjunction with the drive shaft 28. The cam 162 rotates tomove the work piece forward and into engagement with the grinding wheelthrough the interaction of the adjustment arm 172 and the related parts.The forward motion of the work piece drive shaft 104 is against theforce of spring 122 and is limited by the collar 102. Simultaneously,the cam 180 is rotating with the cam 162. The rotation of cam 180 causesthe interaction of the slide cams of cam assemblies 40 and 42 to pivotthe housing and work piece toward the grinding wheel to increase thedepth of the cut of the grinding wheel. Initially, the cam faces 192 and194 interact to pivot the housing slightly, during which time a margin206 (shown in H6. 9) is ground on a rib 208. Further rotation of camplaces the steps of cam faces 200 and 202 into contact to pivot furtherthe housing and cause the work piece to be moved into the grinding wheelfor a deeper cut, thereby forming a land 210. It should be noted thatthe step from the margin 206 to the land 210 is not a sharp step, butrathera broad fillet which improves the strength of the margin. When thegrinding wheel reaches the end of rib 208, cam 162 releases the arm 172so that spring 122 retracts the work piece. Further rotation of the cams162 and 180 appropriately positions the work piece for formation ofmargin 212 and land 214 of rib 216 in the manner described above formargin 206 and land 210. While a cut is being made as described above,the table 14 is being moved slightly forward. Thus, the follower 88moves up along the straight edge 90 to push in the rack 84, therebyrotating the gears 76 and 78 to rotate slightly the carrier of theplanetary gear and thereby rotating the work piece slightly relative tothe action of the cams and thus achieving perfect helical surfaces onthe work piece so that the margins 206 and 212 each have a constantwidth over their respective lengths.

It should be noted that this device is particularly adapted for grindinga reduced size drilling surface on a twist drill to make a stepped drillor rework a stepped drill. The present device performs three functionssimultaneously. First, the margin is formed. Second, a land is almostsimultaneously formed. In passing, it should be noted that there is afillet between the margin and the land, thereby avoiding the point ofstress concentration and prolonging the drill life. The third functionis that the drill is stepped, with a slope or bevel between the largerand the smaller sizes. There is only one cut necessary to complete thedrill, thereby completing the work piece in one simple operation.

Although the specific disclosure shown and described above grinds ahelical surface having a righthand twist, it is readily apparent thatthe instant device can be adapted to grind a left-hand twist by theappropriate addition of gears and the modification of the cams. All ofthese modifications are readily apparent to one skilled in the art.

Although a specific embodiment of the herein-disclosed invention hasbeen described in detail above, it

may be appreciated that those skilled in the art may make othermodifications and changes in the specific grinding machine disclosedabove without departing from the spirit and scope of the presentinvention. It is to be expressly understood that the instant inventionis limited only by the appended claims.

What is claimed is:

l. A grinding machine comprising, a rotary grinding wheel,'a tablemovably mounted adjacent to the grinding wheel, a power source, a driveshaft mounted on the table and drivingly connected to the power sourceto be driven thereby, an epicyclic-gear train mounted on the table andbeing drivingly connected to the drive shaft, a work piece drive shaftrotatably mounted on the table and being drivingly connected to theoutput of the epicyclic-gear train, a cam shaft drivingly connected tothe power source and being geared to the drive shaft for drivinginterconnection therewith, a first cam mounted on the cam shaft andbeing connected to the work piece drive shaft for selectively moving thework piece drive shaft axially relative to the grinding wheel, a secondcam mounted on the cam shaft for selectively moving the work piece driveshaft relative to the grinding wheel to affect the depth of cut of thegrinding wheel, and a control device having a first portion fixed and asecond portion movable relative to the first portion and being connectedto the epicyclic-gear train for affecting the rotation of the work piecedrive shaft.

2. A grinding machine as defined in claim 1 wherein the epicyclic-geartrain includes a sun gear connected to the drive shaft, a firstplanetary gear meshing with the sun gear, a second planetary gearconnected to the first planetary gear for rotation therewith, a carrierrotatably supporting the planetary gears, and a second sun gear meshingwith the second planetary gear, said second sun gear being drivinglyconnected to the work piece drive shaft, said carrier being connected tothe second portion of the control device.

3. A grinding machine as defined in claim 1, including a first cam rodconnected to the first cam and to the work piece drive shaft for movingthe work piece drive shaft axially relative to the grinding wheel toposition axially the work piece drive shaft relative to the grindingwheel, and a second cam rod connected to the second cam and to the workpiece drive shaft for positioning the work piece drive shaft relative tothe grinding wheel to affect the depth of cut of the grinding wheel;

4. A grinding machine as defined in claim 1, including a second cam rodconnected to the second cam and to the work piece drive shaft forpivoting the work piece drive shaft relative to the grinding wheel.

5. A grinding machine as defined in claim 1, including a first cam rodconnected to the first cam and to the work piece drive shaft for movingthe work piece drive shaft axially to position selectively the driveshaft relative to the grinding wheel.

6. A grinding machine comprising, a rotary grinding wheel, a tablemovably mounted adjacent to the grinding wheel, a work piece drive shaftrotatably mounted on the table and being adapted for connection to awork piece, an epicyclic-gear train mounted on the table for movementtherewith, said epicyclic-gear train having an output shaft drivinglyconnected to the work piece drive shaft, a power source drivinglyconnected to the epicyclic-gear train, and means connected to theepicyclic-gear train to control the rotation of the output shaft inresponse to the position of the table relative to the grinding wheel.

7. A grinding machine as defined in claim 6, including a cam drivinglyconnected to the power source, said cam being connected to the workpiece drive shaft for moving the work piece drive shaft relative to thegrinding wheel to affect the depth of cut of the grinding wheel.

8'. A grinding machine as defined in claim 7, including a slide cam anda rod connected to the first-mentioned cam, said slide cam beingconnected to the work piece drive shaft for moving the work piece driveshaft relative to the grinding wheel.

9. A grinding machine as defined in claim 6, including a housingpivotedly mounted on the table and slideably and rotatably receiving thework piece drive shaft, a cam connected to the power source, said cambeing connected to the work piece drive shaft for moving the shaftaxially, and said epicyclic-gear train includes a first sun geardrivingly connected to the power source, a first planetary gear meshingwith the first sun gear, a second planetary gear drivingly fixed to thefirst planetary gear, a carrier rotatably supporting the planetarygears, said carrier connected to the means connected to theepicyclic-gear train to control the rotation of the output shaft, and asecond sun gear meshing with the second planetary gear, said second sungear being drivingly connected to the work piece drive shaft.

10. A grinding machine as defined in claim 9, including a second camdrivingly connected to the first-mentioned cam for rotation therewith, aslide cam drivingly connected to the second cam, said slide cam beingconnected to the work piece drive shaft for pivoting the work piecedrive shaft relative to the table to position the work piece drive shaftrelative to the grinding wheel.

11. A grinding machine as defined in claim 6 wherein the epicyclic-geartrain includes a drive sun gear drivingly connected to the power source,a first planetary gear meshing with the drive sun gear, a secondplanetary gear drivingly connected to the first planetary gear forrotation therewith, a carrier rotatably supporting the planetary gearsand being movable about the drive sun gear, and an output sun gearmeshing with the second planetary gear and being drivingly connected tothe work piece drive shaft, said means connected to the epicyclic-geartrain, including a straight edge fixed relative to the grinding wheeland being angularly adjustable relative to the direction'of movement ofthe table, and'a follower engageable with the straight edge and beingconnected to the carrier.

12. A grinding machine as defined in claim 6 wherein the means connectedto the epicyclic-gear train to control the rotation of the output shaftincludes a straight edge fixed relative to the rotary grinding wheel,and a follower movably mounted on the table and engageable with thestraight edge, said follower being connected to the epicyclic-geartrain.

13. A grinding machine as defined in claim 6, including a cam drivinglyconnected to the power source, said cam being connected to a work piecefor moving the work piece axially relative to the grinding wheel.

14. A grinding machine as defined in claim 6 wherein the epicyclic-geartrain includes a sun gear drivingly connected to the power source, afirst planetary gear meshing with the sun gear, a second planetary gearfixed to the first planetary gear for rotation therewith, a carrierrotatably supporting the first and second planetary gears, said carrierconnected to the means connected to the epicyclic-gear train to controlthe rotation of the output shaft, and a second sun gear meshing with thesecond planetary gear and being drivingly connected to the work piecedrive shaft, and including a drive housing pivotedly mounted on thetable and rotatably receiving the work piece drive shaft, a camdrivingly connected to the power source, a slide cam and rod connectedto the cam, said slide cam being connected to the drive housing forpivoting the drive housing relative to the grinding wheel.

15. A grinding machine as defined in claim 6, including a cam shaftdrivingly connected to the power source and being drivingly connected tothe epicyclicgear train, a first cam mounted on the cam shaft and beingconnected to a work piece for moving the work piece axially relative tothe grinding wheel, and a second cam mounted on the cam shaft and beingconnected to the work piece for moving the work piece. relative to thegrinding wheel to affect the depth of the cut in the work piece.

16. A grinding machine as defined in claim 6 wherein the epicyclic-geartrain includes a sun gear drivingly connected to the power source, afirst planetary gear meshing with the sun gear, a second planetary gearfixed to the first planetary gear, a carrier rotatably supporting theplanetary gears, said carrier being connected to said means connected tothe epicyclic-gear train to control the rotation of the output shaft,and a second sun gear meshing with the second planetary gear, saidsecond sun gear being drivingly connected to the work piece drive shaft.

17. A grinding machine comprising, a frame, a rotary grinding wheelfixedly mounted relative to the frame, a table movably mounted on theframe adjacent to the grinding wheel, a power source mounted onthe'table, a drive shaft rotatably mounted on the table and connected tothe power source by gears, an epicyclic-gear train mounted on the tableand having its input drivingly connected to the drive shaft, a workpiece drive housing pivotedly mounted on the table adjacent to thegrinding wheel, a work piece drive shaft rotatably mounted in the workpiece drive housing and being adapted for connection to a work piece,said work piece drive shaft being drivingly connected to the output ofthe epicyclic-gear train, a control member fixed to the frame, a controldevice engageable with the control member and being connected to theepicyclicgear train for controlling the output of the epicyclicgeartrain to position angularly the work piece drive shaft in response toits axial position relative to the rotary grinding wheel, a cam shaftrotatably mounted on the table and being connected to the power sourceand to the drive shaft, a first cam mounted on the cam shaft, a firstcam rod connected to the cam shaft and to the work piece drive shaft formoving the drive shaft axially in the housing for selectivelypositioning the drive shaft relative to the grinding wheel, a second cammounted on the cam shaft, and a second cam rod connected to the camshaft and being connected to the housing for pivoting the housing withthe work piece drive shaft relative to the table and relative to thegrinding wheel.

18. A grinding machine as defined in claim 17 wherein the epicyclic-geartrain includes an input sun gear connected to the drive shaft, a firstplanetary gear meshing with the input sun gear, a second planetary geardrivingly fixed to the first planetary gear, an output sun gear meshingwith the second planetary ear and being drivingly connected to the workpiece rive shaft, and a carrier rotatably supporting the planetary gearsand being connected to the control device for rotation thereby to rotatethe planetary gears about their respective sun gears.

19. A grinding machine as defined in claim 18, including a first slidecam connected to the second cam rod for pivoting slightly the housing,and a second slide cam connected to the second cam rod for pivoting thehousing a greater amount after initial movement by the first slide cam.

20. A grinding machine as defined in claim 17, including a first slidecam connected to the second cam rod for pivoting slightly the housing,and a second slide cam for pivoting the housing a greater amount afterinitial movement by the first slide cam.

1. A grinding machine comprising, a rotary grinding wheel, a tablemovably mounted adjacent to the grinding wheel, a power source, a driveshaft mounted on the table and drivingly connected to the power sourceto be driven thereby, an epicyclicgear train mounted on the table andbeing drivingly connected to the drive shaft, a work piece drive shaftrotatably mounted on the table and being drivingly connected to theoutput of the epicyclic-gear train, a cam shaft drivingly connected tothe power source and being geared to the drive shaft for drivinginterconnection therewith, a first cam mounted on the cam shaft andbeing connected to the work piece drive shaft for selectively moving thework piece drive shaft axially relative to the grinding wheel, a secondcam mounted on the cam shaft for selectively moving the work piece driveshaft relative to the grinding wheel to affect the depth of cut of thegrinding wheel, and a control device having a first portion fixed and asecond portion movable relative to the first portion and being connectedto the epicyclic-gear train for affecting the rotation of the work piecedrive shaft.
 2. A grinding machine as defined in claim 1 wherein theepicyclic-gear train includes a sun gear connected to the drive shaft, afirst planetary gear meshing with the sun gear, a second planetary gearconnected to the first planetary gear for rotation therewith, a carrierrotatably supporting the planetary gears, and a second sun gear meshingwith the second planetary gear, said second sun gear bEing drivinglyconnected to the work piece drive shaft, said carrier being connected tothe second portion of the control device.
 3. A grinding machine asdefined in claim 1, including a first cam rod connected to the first camand to the work piece drive shaft for moving the work piece drive shaftaxially relative to the grinding wheel to position axially the workpiece drive shaft relative to the grinding wheel, and a second cam rodconnected to the second cam and to the work piece drive shaft forpositioning the work piece drive shaft relative to the grinding wheel toaffect the depth of cut of the grinding wheel.
 4. A grinding machine asdefined in claim 1, including a second cam rod connected to the secondcam and to the work piece drive shaft for pivoting the work piece driveshaft relative to the grinding wheel.
 5. A grinding machine as definedin claim 1, including a first cam rod connected to the first cam and tothe work piece drive shaft for moving the work piece drive shaft axiallyto position selectively the drive shaft relative to the grinding wheel.6. A grinding machine comprising, a rotary grinding wheel, a tablemovably mounted adjacent to the grinding wheel, a work piece drive shaftrotatably mounted on the table and being adapted for connection to awork piece, an epicyclic-gear train mounted on the table for movementtherewith, said epicyclic-gear train having an output shaft drivinglyconnected to the work piece drive shaft, a power source drivinglyconnected to the epicyclic-gear train, and means connected to theepicyclic-gear train to control the rotation of the output shaft inresponse to the position of the table relative to the grinding wheel. 7.A grinding machine as defined in claim 6, including a cam drivinglyconnected to the power source, said cam being connected to the workpiece drive shaft for moving the work piece drive shaft relative to thegrinding wheel to affect the depth of cut of the grinding wheel.
 8. Agrinding machine as defined in claim 7, including a slide cam and a rodconnected to the first-mentioned cam, said slide cam being connected tothe work piece drive shaft for moving the work piece drive shaftrelative to the grinding wheel.
 9. A grinding machine as defined inclaim 6, including a housing pivotedly mounted on the table andslideably and rotatably receiving the work piece drive shaft, a camconnected to the power source, said cam being connected to the workpiece drive shaft for moving the shaft axially, and said epicyclic-geartrain includes a first sun gear drivingly connected to the power source,a first planetary gear meshing with the first sun gear, a secondplanetary gear drivingly fixed to the first planetary gear, a carrierrotatably supporting the planetary gears, said carrier connected to themeans connected to the epicyclic-gear train to control the rotation ofthe output shaft, and a second sun gear meshing with the secondplanetary gear, said second sun gear being drivingly connected to thework piece drive shaft.
 10. A grinding machine as defined in claim 9,including a second cam drivingly connected to the first-mentioned camfor rotation therewith, a slide cam drivingly connected to the secondcam, said slide cam being connected to the work piece drive shaft forpivoting the work piece drive shaft relative to the table to positionthe work piece drive shaft relative to the grinding wheel.
 11. Agrinding machine as defined in claim 6 wherein the epicyclic-gear trainincludes a drive sun gear drivingly connected to the power source, afirst planetary gear meshing with the drive sun gear, a second planetarygear drivingly connected to the first planetary gear for rotationtherewith, a carrier rotatably supporting the planetary gears and beingmovable about the drive sun gear, and an output sun gear meshing withthe second planetary gear and being drivingly connected to the workpiece drive shaft, said means connected to the epicyclic-gear train,including a straight edge fixed rElative to the grinding wheel and beingangularly adjustable relative to the direction of movement of the table,and a follower engageable with the straight edge and being connected tothe carrier.
 12. A grinding machine as defined in claim 6 wherein themeans connected to the epicyclic-gear train to control the rotation ofthe output shaft includes a straight edge fixed relative to the rotarygrinding wheel, and a follower movably mounted on the table andengageable with the straight edge, said follower being connected to theepicyclic-gear train.
 13. A grinding machine as defined in claim 6,including a cam drivingly connected to the power source, said cam beingconnected to a work piece for moving the work piece axially relative tothe grinding wheel.
 14. A grinding machine as defined in claim 6 whereinthe epicyclic-gear train includes a sun gear drivingly connected to thepower source, a first planetary gear meshing with the sun gear, a secondplanetary gear fixed to the first planetary gear for rotation therewith,a carrier rotatably supporting the first and second planetary gears,said carrier connected to the means connected to the epicyclic-geartrain to control the rotation of the output shaft, and a second sun gearmeshing with the second planetary gear and being drivingly connected tothe work piece drive shaft, and including a drive housing pivotedlymounted on the table and rotatably receiving the work piece drive shaft,a cam drivingly connected to the power source, a slide cam and rodconnected to the cam, said slide cam being connected to the drivehousing for pivoting the drive housing relative to the grinding wheel.15. A grinding machine as defined in claim 6, including a cam shaftdrivingly connected to the power source and being drivingly connected tothe epicyclic-gear train, a first cam mounted on the cam shaft and beingconnected to a work piece for moving the work piece axially relative tothe grinding wheel, and a second cam mounted on the cam shaft and beingconnected to the work piece for moving the work piece relative to thegrinding wheel to affect the depth of the cut in the work piece.
 16. Agrinding machine as defined in claim 6 wherein the epicyclic-gear trainincludes a sun gear drivingly connected to the power source, a firstplanetary gear meshing with the sun gear, a second planetary gear fixedto the first planetary gear, a carrier rotatably supporting theplanetary gears, said carrier being connected to said means connected tothe epicyclic-gear train to control the rotation of the output shaft,and a second sun gear meshing with the second planetary gear, saidsecond sun gear being drivingly connected to the work piece drive shaft.17. A grinding machine comprising, a frame, a rotary grinding wheelfixedly mounted relative to the frame, a table movably mounted on theframe adjacent to the grinding wheel, a power source mounted on thetable, a drive shaft rotatably mounted on the table and connected to thepower source by gears, an epicyclic-gear train mounted on the table andhaving its input drivingly connected to the drive shaft, a work piecedrive housing pivotedly mounted on the table adjacent to the grindingwheel, a work piece drive shaft rotatably mounted in the work piecedrive housing and being adapted for connection to a work piece, saidwork piece drive shaft being drivingly connected to the output of theepicyclic-gear train, a control member fixed to the frame, a controldevice engageable with the control member and being connected to theepicyclic-gear train for controlling the output of the epicyclic-geartrain to position angularly the work piece drive shaft in response toits axial position relative to the rotary grinding wheel, a cam shaftrotatably mounted on the table and being connected to the power sourceand to the drive shaft, a first cam mounted on the cam shaft, a firstcam rod connected to the cam shaft and to the work piece drive shaft formoving the drive shaft axially in the housing for selectivelypositioning the drive shaft relative to the grinding wheel, a second cammounted on the cam shaft, and a second cam rod connected to the camshaft and being connected to the housing for pivoting the housing withthe work piece drive shaft relative to the table and relative to thegrinding wheel.
 18. A grinding machine as defined in claim 17 whereinthe epicyclic-gear train includes an input sun gear connected to thedrive shaft, a first planetary gear meshing with the input sun gear, asecond planetary gear drivingly fixed to the first planetary gear, anoutput sun gear meshing with the second planetary gear and beingdrivingly connected to the work piece drive shaft, and a carrierrotatably supporting the planetary gears and being connected to thecontrol device for rotation thereby to rotate the planetary gears abouttheir respective sun gears.
 19. A grinding machine as defined in claim18, including a first slide cam connected to the second cam rod forpivoting slightly the housing, and a second slide cam connected to thesecond cam rod for pivoting the housing a greater amount after initialmovement by the first slide cam.
 20. A grinding machine as defined inclaim 17, including a first slide cam connected to the second cam rodfor pivoting slightly the housing, and a second slide cam for pivotingthe housing a greater amount after initial movement by the first slidecam.